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Each object is born with a key (monitor), then the method is modified by the synchronized equivalent to a method to add a lock, this method can be synchronized, in multi-threaded time, there is no thread security issues.
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1. A picture

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2. Image corresponding to the code

Import Java.util.Date;

/**
* Test the Object class
*
* @author:d Ufy
* @version: 1.0.0
* @date 2017/9/29
* @email [email protected]
*/
public class Objecttest {

Public synchronized void MethodA () {
try {
System.out.println ("This is MethodA ..." + thread.currentthread (). GetName () + ":" + New Date ());
Thread.Sleep (1000);
} catch (Interruptedexception e) {
E.printstacktrace ();
}

}

public void MethodB () {

System.out.println ("This is MethodB ..." + thread.currentthread (). GetName () + ":" + New Date ());
}

Public synchronized void Methodc () {

try {
System.out.println ("This is methodc ..." + thread.currentthread (). GetName () + ":" + New Date ());
Thread.Sleep (3000);
} catch (Interruptedexception e) {
E.printstacktrace ();
}

}

}
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Package Com.dufy.concurrentcode;

/**
* Test Thread class
*
* @author:d Ufy
* @version: 1.0.0
* @date 2017/9/29
* @email [email protected]
*/
public class ThreadTest extends thread{

public static void Main (string[] args) {
Objecttest ot = new Objecttest ();
Thread1 T1 = new Thread1 (OT, "thread1");
Thread2 t2 = new Thread2 (OT, "thread2");
Thread3 t3 = new Thread3 (OT, "thread3");
Thread4 T4 = new Thread4 (OT, "thread4");
T1.start ();
T2.start ();
T3.start ();
T4.start ();
}

Static class Thread1 extends thread{
Private Objecttest objecttest;

Public Thread1 (objecttest objecttest,string name) {
SetName (name);
This.objecttest = Objecttest;
}
@Override
public void Run () {
Super.run ();
Objecttest.methoda ();
}
}

Static class Thread2 extends thread{
Private Objecttest objecttest;

Public Thread2 (objecttest objecttest,string name) {
SetName (name);
This.objecttest = Objecttest;
}
@Override
public void Run () {
Super.run ();
Objecttest.methodb ();
}
}

Static class Thread3 extends thread{
Private Objecttest objecttest;

Public Thread3 (objecttest objecttest,string name) {
SetName (name);
This.objecttest = Objecttest;
}
@Override
public void Run () {
Super.run ();
Objecttest.methoda ();
}
}

Static class Thread4 extends thread{
Private Objecttest objecttest;

Public Thread4 (objecttest objecttest,string name) {
SetName (name);
This.objecttest = objecttest;
}
@Override
public void Run () {
Super.run ();
Objecttest.methodc ();
}
}
}
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[
] the "
"
, "
", "the"
, "the" "Bayi
" operation Result:

This is MethodB. Thread2:fri Sep 23:21:17 CST 2017
This is MethodA. Thread1:fri Sep 23:21:17 CST 2017
This is methodc. Thread4:fri Sep 23:21:18 CST 2017
This is MethodA. Thread3:fri Sep 23:21:21 CST 2017
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Note:
1, the results of the operation may be different from the threading process, there is no relationship, as long as the understanding of the object lock and synchronized core idea is good, the operation of the thread is inherently random this feature.
2, this code is synchronous method, in fact, synchronous code block is also a reason, synchronous code block with synchronized (this) time, when a thread accesses the object of a synchronized (this) synchronization code block, Other threads block access to all other synchronized (this) synchronizations in object (blocking the synchronous block of code and the way the thread can still enter the synchronized code block).

3. Summary

Each object has a lock (object monitor), and the keyword synchronized acquisition lock is an object lock, rather than a piece of code or method (function) as a lock.
Shows which thread first executes the method with the Synchronized keyword and which thread holds the key to the object the method belongs to. Other threads can only be in a wait state.
Call the keyword Synchronized declaration method, must be queued to run. This is the role of using the Synchronized keyword, queued to run, if there is a shared resource, then the read of shared resources is thread-safe.
If a thread holds the key to object, other threads can access the object without a lock method, that is, a non-synchronized type method.
4. Reference

Java multithreaded Programming Core technology

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